Photo manipulation to replace a person in a picture with another person

"Hi, I'm an American Idol junkie and am completely ecstatic to see my favourite Shannon Magrane become a finalist! Know what, I had a strange dream... that Justin Bieber and Shannon Magrane were seeing each other... that she was at his birthday yesterday (i.e. March 1) right after the American Idol announcements... and they looked so good together... Justin at 18, Shannon a sweet-16... Don't be offended Selena, it was just a dream..."